1 /* 2 * drivers/usb/core/sysfs.c 3 * 4 * (C) Copyright 2002 David Brownell 5 * (C) Copyright 2002,2004 Greg Kroah-Hartman 6 * (C) Copyright 2002,2004 IBM Corp. 7 * 8 * All of the sysfs file attributes for usb devices and interfaces. 9 * 10 */ 11 12 13 #include <linux/kernel.h> 14 #include <linux/string.h> 15 #include <linux/usb.h> 16 #include "usb.h" 17 18 /* Active configuration fields */ 19 #define usb_actconfig_show(field, multiplier, format_string) \ 20 static ssize_t show_##field(struct device *dev, \ 21 struct device_attribute *attr, char *buf) \ 22 { \ 23 struct usb_device *udev; \ 24 struct usb_host_config *actconfig; \ 25 \ 26 udev = to_usb_device(dev); \ 27 actconfig = udev->actconfig; \ 28 if (actconfig) \ 29 return sprintf(buf, format_string, \ 30 actconfig->desc.field * multiplier); \ 31 else \ 32 return 0; \ 33 } \ 34 35 #define usb_actconfig_attr(field, multiplier, format_string) \ 36 usb_actconfig_show(field, multiplier, format_string) \ 37 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 38 39 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n") 40 usb_actconfig_attr(bmAttributes, 1, "%2x\n") 41 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n") 42 43 static ssize_t show_configuration_string(struct device *dev, 44 struct device_attribute *attr, char *buf) 45 { 46 struct usb_device *udev; 47 struct usb_host_config *actconfig; 48 49 udev = to_usb_device(dev); 50 actconfig = udev->actconfig; 51 if ((!actconfig) || (!actconfig->string)) 52 return 0; 53 return sprintf(buf, "%s\n", actconfig->string); 54 } 55 static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL); 56 57 /* configuration value is always present, and r/w */ 58 usb_actconfig_show(bConfigurationValue, 1, "%u\n"); 59 60 static ssize_t 61 set_bConfigurationValue(struct device *dev, struct device_attribute *attr, 62 const char *buf, size_t count) 63 { 64 struct usb_device *udev = to_usb_device(dev); 65 int config, value; 66 67 if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255) 68 return -EINVAL; 69 usb_lock_device(udev); 70 value = usb_set_configuration(udev, config); 71 usb_unlock_device(udev); 72 return (value < 0) ? value : count; 73 } 74 75 static DEVICE_ATTR(bConfigurationValue, S_IRUGO | S_IWUSR, 76 show_bConfigurationValue, set_bConfigurationValue); 77 78 /* String fields */ 79 #define usb_string_attr(name) \ 80 static ssize_t show_##name(struct device *dev, \ 81 struct device_attribute *attr, char *buf) \ 82 { \ 83 struct usb_device *udev; \ 84 \ 85 udev = to_usb_device(dev); \ 86 return sprintf(buf, "%s\n", udev->name); \ 87 } \ 88 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 89 90 usb_string_attr(product); 91 usb_string_attr(manufacturer); 92 usb_string_attr(serial); 93 94 static ssize_t 95 show_speed(struct device *dev, struct device_attribute *attr, char *buf) 96 { 97 struct usb_device *udev; 98 char *speed; 99 100 udev = to_usb_device(dev); 101 102 switch (udev->speed) { 103 case USB_SPEED_LOW: 104 speed = "1.5"; 105 break; 106 case USB_SPEED_UNKNOWN: 107 case USB_SPEED_FULL: 108 speed = "12"; 109 break; 110 case USB_SPEED_HIGH: 111 speed = "480"; 112 break; 113 default: 114 speed = "unknown"; 115 } 116 return sprintf(buf, "%s\n", speed); 117 } 118 static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL); 119 120 static ssize_t 121 show_busnum(struct device *dev, struct device_attribute *attr, char *buf) 122 { 123 struct usb_device *udev; 124 125 udev = to_usb_device(dev); 126 return sprintf(buf, "%d\n", udev->bus->busnum); 127 } 128 static DEVICE_ATTR(busnum, S_IRUGO, show_busnum, NULL); 129 130 static ssize_t 131 show_devnum(struct device *dev, struct device_attribute *attr, char *buf) 132 { 133 struct usb_device *udev; 134 135 udev = to_usb_device(dev); 136 return sprintf(buf, "%d\n", udev->devnum); 137 } 138 static DEVICE_ATTR(devnum, S_IRUGO, show_devnum, NULL); 139 140 static ssize_t 141 show_version(struct device *dev, struct device_attribute *attr, char *buf) 142 { 143 struct usb_device *udev; 144 u16 bcdUSB; 145 146 udev = to_usb_device(dev); 147 bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); 148 return sprintf(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); 149 } 150 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 151 152 static ssize_t 153 show_maxchild(struct device *dev, struct device_attribute *attr, char *buf) 154 { 155 struct usb_device *udev; 156 157 udev = to_usb_device(dev); 158 return sprintf(buf, "%d\n", udev->maxchild); 159 } 160 static DEVICE_ATTR(maxchild, S_IRUGO, show_maxchild, NULL); 161 162 static ssize_t 163 show_quirks(struct device *dev, struct device_attribute *attr, char *buf) 164 { 165 struct usb_device *udev; 166 167 udev = to_usb_device(dev); 168 return sprintf(buf, "0x%x\n", udev->quirks); 169 } 170 static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); 171 172 static ssize_t 173 show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) 174 { 175 struct usb_device *udev; 176 177 udev = to_usb_device(dev); 178 return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); 179 } 180 static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); 181 182 183 #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND) 184 static const char power_group[] = "power"; 185 #endif 186 187 #ifdef CONFIG_USB_PERSIST 188 189 static ssize_t 190 show_persist(struct device *dev, struct device_attribute *attr, char *buf) 191 { 192 struct usb_device *udev = to_usb_device(dev); 193 194 return sprintf(buf, "%d\n", udev->persist_enabled); 195 } 196 197 static ssize_t 198 set_persist(struct device *dev, struct device_attribute *attr, 199 const char *buf, size_t count) 200 { 201 struct usb_device *udev = to_usb_device(dev); 202 int value; 203 204 /* Hubs are always enabled for USB_PERSIST */ 205 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 206 return -EPERM; 207 208 if (sscanf(buf, "%d", &value) != 1) 209 return -EINVAL; 210 usb_pm_lock(udev); 211 udev->persist_enabled = !!value; 212 usb_pm_unlock(udev); 213 return count; 214 } 215 216 static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); 217 218 static int add_persist_attributes(struct device *dev) 219 { 220 int rc = 0; 221 222 if (is_usb_device(dev)) { 223 struct usb_device *udev = to_usb_device(dev); 224 225 /* Hubs are automatically enabled for USB_PERSIST */ 226 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) 227 udev->persist_enabled = 1; 228 rc = sysfs_add_file_to_group(&dev->kobj, 229 &dev_attr_persist.attr, 230 power_group); 231 } 232 return rc; 233 } 234 235 static void remove_persist_attributes(struct device *dev) 236 { 237 sysfs_remove_file_from_group(&dev->kobj, 238 &dev_attr_persist.attr, 239 power_group); 240 } 241 242 #else 243 244 #define add_persist_attributes(dev) 0 245 #define remove_persist_attributes(dev) do {} while (0) 246 247 #endif /* CONFIG_USB_PERSIST */ 248 249 #ifdef CONFIG_USB_SUSPEND 250 251 static ssize_t 252 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) 253 { 254 struct usb_device *udev = to_usb_device(dev); 255 256 return sprintf(buf, "%d\n", udev->autosuspend_delay / HZ); 257 } 258 259 static ssize_t 260 set_autosuspend(struct device *dev, struct device_attribute *attr, 261 const char *buf, size_t count) 262 { 263 struct usb_device *udev = to_usb_device(dev); 264 int value; 265 266 if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/HZ || 267 value <= - INT_MAX/HZ) 268 return -EINVAL; 269 value *= HZ; 270 271 udev->autosuspend_delay = value; 272 if (value >= 0) 273 usb_try_autosuspend_device(udev); 274 else { 275 if (usb_autoresume_device(udev) == 0) 276 usb_autosuspend_device(udev); 277 } 278 return count; 279 } 280 281 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, 282 show_autosuspend, set_autosuspend); 283 284 static const char on_string[] = "on"; 285 static const char auto_string[] = "auto"; 286 static const char suspend_string[] = "suspend"; 287 288 static ssize_t 289 show_level(struct device *dev, struct device_attribute *attr, char *buf) 290 { 291 struct usb_device *udev = to_usb_device(dev); 292 const char *p = auto_string; 293 294 if (udev->state == USB_STATE_SUSPENDED) { 295 if (udev->autoresume_disabled) 296 p = suspend_string; 297 } else { 298 if (udev->autosuspend_disabled) 299 p = on_string; 300 } 301 return sprintf(buf, "%s\n", p); 302 } 303 304 static ssize_t 305 set_level(struct device *dev, struct device_attribute *attr, 306 const char *buf, size_t count) 307 { 308 struct usb_device *udev = to_usb_device(dev); 309 int len = count; 310 char *cp; 311 int rc = 0; 312 int old_autosuspend_disabled, old_autoresume_disabled; 313 314 cp = memchr(buf, '\n', count); 315 if (cp) 316 len = cp - buf; 317 318 usb_lock_device(udev); 319 old_autosuspend_disabled = udev->autosuspend_disabled; 320 old_autoresume_disabled = udev->autoresume_disabled; 321 322 /* Setting the flags without calling usb_pm_lock is a subject to 323 * races, but who cares... 324 */ 325 if (len == sizeof on_string - 1 && 326 strncmp(buf, on_string, len) == 0) { 327 udev->autosuspend_disabled = 1; 328 udev->autoresume_disabled = 0; 329 rc = usb_external_resume_device(udev); 330 331 } else if (len == sizeof auto_string - 1 && 332 strncmp(buf, auto_string, len) == 0) { 333 udev->autosuspend_disabled = 0; 334 udev->autoresume_disabled = 0; 335 rc = usb_external_resume_device(udev); 336 337 } else if (len == sizeof suspend_string - 1 && 338 strncmp(buf, suspend_string, len) == 0) { 339 udev->autosuspend_disabled = 0; 340 udev->autoresume_disabled = 1; 341 rc = usb_external_suspend_device(udev, PMSG_SUSPEND); 342 343 } else 344 rc = -EINVAL; 345 346 if (rc) { 347 udev->autosuspend_disabled = old_autosuspend_disabled; 348 udev->autoresume_disabled = old_autoresume_disabled; 349 } 350 usb_unlock_device(udev); 351 return (rc < 0 ? rc : count); 352 } 353 354 static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); 355 356 static int add_power_attributes(struct device *dev) 357 { 358 int rc = 0; 359 360 if (is_usb_device(dev)) { 361 rc = sysfs_add_file_to_group(&dev->kobj, 362 &dev_attr_autosuspend.attr, 363 power_group); 364 if (rc == 0) 365 rc = sysfs_add_file_to_group(&dev->kobj, 366 &dev_attr_level.attr, 367 power_group); 368 } 369 return rc; 370 } 371 372 static void remove_power_attributes(struct device *dev) 373 { 374 sysfs_remove_file_from_group(&dev->kobj, 375 &dev_attr_level.attr, 376 power_group); 377 sysfs_remove_file_from_group(&dev->kobj, 378 &dev_attr_autosuspend.attr, 379 power_group); 380 } 381 382 #else 383 384 #define add_power_attributes(dev) 0 385 #define remove_power_attributes(dev) do {} while (0) 386 387 #endif /* CONFIG_USB_SUSPEND */ 388 389 390 /* Descriptor fields */ 391 #define usb_descriptor_attr_le16(field, format_string) \ 392 static ssize_t \ 393 show_##field(struct device *dev, struct device_attribute *attr, \ 394 char *buf) \ 395 { \ 396 struct usb_device *udev; \ 397 \ 398 udev = to_usb_device(dev); \ 399 return sprintf(buf, format_string, \ 400 le16_to_cpu(udev->descriptor.field)); \ 401 } \ 402 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 403 404 usb_descriptor_attr_le16(idVendor, "%04x\n") 405 usb_descriptor_attr_le16(idProduct, "%04x\n") 406 usb_descriptor_attr_le16(bcdDevice, "%04x\n") 407 408 #define usb_descriptor_attr(field, format_string) \ 409 static ssize_t \ 410 show_##field(struct device *dev, struct device_attribute *attr, \ 411 char *buf) \ 412 { \ 413 struct usb_device *udev; \ 414 \ 415 udev = to_usb_device(dev); \ 416 return sprintf(buf, format_string, udev->descriptor.field); \ 417 } \ 418 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 419 420 usb_descriptor_attr(bDeviceClass, "%02x\n") 421 usb_descriptor_attr(bDeviceSubClass, "%02x\n") 422 usb_descriptor_attr(bDeviceProtocol, "%02x\n") 423 usb_descriptor_attr(bNumConfigurations, "%d\n") 424 usb_descriptor_attr(bMaxPacketSize0, "%d\n") 425 426 427 428 /* show if the device is authorized (1) or not (0) */ 429 static ssize_t usb_dev_authorized_show(struct device *dev, 430 struct device_attribute *attr, 431 char *buf) 432 { 433 struct usb_device *usb_dev = to_usb_device(dev); 434 return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); 435 } 436 437 438 /* 439 * Authorize a device to be used in the system 440 * 441 * Writing a 0 deauthorizes the device, writing a 1 authorizes it. 442 */ 443 static ssize_t usb_dev_authorized_store(struct device *dev, 444 struct device_attribute *attr, 445 const char *buf, size_t size) 446 { 447 ssize_t result; 448 struct usb_device *usb_dev = to_usb_device(dev); 449 unsigned val; 450 result = sscanf(buf, "%u\n", &val); 451 if (result != 1) 452 result = -EINVAL; 453 else if (val == 0) 454 result = usb_deauthorize_device(usb_dev); 455 else 456 result = usb_authorize_device(usb_dev); 457 return result < 0? result : size; 458 } 459 460 static DEVICE_ATTR(authorized, 0644, 461 usb_dev_authorized_show, usb_dev_authorized_store); 462 463 464 static struct attribute *dev_attrs[] = { 465 /* current configuration's attributes */ 466 &dev_attr_configuration.attr, 467 &dev_attr_bNumInterfaces.attr, 468 &dev_attr_bConfigurationValue.attr, 469 &dev_attr_bmAttributes.attr, 470 &dev_attr_bMaxPower.attr, 471 &dev_attr_urbnum.attr, 472 /* device attributes */ 473 &dev_attr_idVendor.attr, 474 &dev_attr_idProduct.attr, 475 &dev_attr_bcdDevice.attr, 476 &dev_attr_bDeviceClass.attr, 477 &dev_attr_bDeviceSubClass.attr, 478 &dev_attr_bDeviceProtocol.attr, 479 &dev_attr_bNumConfigurations.attr, 480 &dev_attr_bMaxPacketSize0.attr, 481 &dev_attr_speed.attr, 482 &dev_attr_busnum.attr, 483 &dev_attr_devnum.attr, 484 &dev_attr_version.attr, 485 &dev_attr_maxchild.attr, 486 &dev_attr_quirks.attr, 487 &dev_attr_authorized.attr, 488 NULL, 489 }; 490 static struct attribute_group dev_attr_grp = { 491 .attrs = dev_attrs, 492 }; 493 494 /* Binary descriptors */ 495 496 static ssize_t 497 read_descriptors(struct kobject *kobj, struct bin_attribute *attr, 498 char *buf, loff_t off, size_t count) 499 { 500 struct usb_device *udev = to_usb_device( 501 container_of(kobj, struct device, kobj)); 502 size_t nleft = count; 503 size_t srclen, n; 504 505 usb_lock_device(udev); 506 507 /* The binary attribute begins with the device descriptor */ 508 srclen = sizeof(struct usb_device_descriptor); 509 if (off < srclen) { 510 n = min_t(size_t, nleft, srclen - off); 511 memcpy(buf, off + (char *) &udev->descriptor, n); 512 nleft -= n; 513 buf += n; 514 off = 0; 515 } else { 516 off -= srclen; 517 } 518 519 /* Then follows the raw descriptor entry for the current 520 * configuration (config plus subsidiary descriptors). 521 */ 522 if (udev->actconfig) { 523 int cfgno = udev->actconfig - udev->config; 524 525 srclen = __le16_to_cpu(udev->actconfig->desc.wTotalLength); 526 if (off < srclen) { 527 n = min_t(size_t, nleft, srclen - off); 528 memcpy(buf, off + udev->rawdescriptors[cfgno], n); 529 nleft -= n; 530 } 531 } 532 usb_unlock_device(udev); 533 return count - nleft; 534 } 535 536 static struct bin_attribute dev_bin_attr_descriptors = { 537 .attr = {.name = "descriptors", .mode = 0444}, 538 .read = read_descriptors, 539 .size = 18 + 65535, /* dev descr + max-size raw descriptor */ 540 }; 541 542 int usb_create_sysfs_dev_files(struct usb_device *udev) 543 { 544 struct device *dev = &udev->dev; 545 int retval; 546 547 retval = sysfs_create_group(&dev->kobj, &dev_attr_grp); 548 if (retval) 549 return retval; 550 551 retval = device_create_bin_file(dev, &dev_bin_attr_descriptors); 552 if (retval) 553 goto error; 554 555 retval = add_persist_attributes(dev); 556 if (retval) 557 goto error; 558 559 retval = add_power_attributes(dev); 560 if (retval) 561 goto error; 562 563 if (udev->manufacturer) { 564 retval = device_create_file(dev, &dev_attr_manufacturer); 565 if (retval) 566 goto error; 567 } 568 if (udev->product) { 569 retval = device_create_file(dev, &dev_attr_product); 570 if (retval) 571 goto error; 572 } 573 if (udev->serial) { 574 retval = device_create_file(dev, &dev_attr_serial); 575 if (retval) 576 goto error; 577 } 578 retval = usb_create_ep_files(dev, &udev->ep0, udev); 579 if (retval) 580 goto error; 581 return 0; 582 error: 583 usb_remove_sysfs_dev_files(udev); 584 return retval; 585 } 586 587 void usb_remove_sysfs_dev_files(struct usb_device *udev) 588 { 589 struct device *dev = &udev->dev; 590 591 usb_remove_ep_files(&udev->ep0); 592 device_remove_file(dev, &dev_attr_manufacturer); 593 device_remove_file(dev, &dev_attr_product); 594 device_remove_file(dev, &dev_attr_serial); 595 remove_power_attributes(dev); 596 remove_persist_attributes(dev); 597 device_remove_bin_file(dev, &dev_bin_attr_descriptors); 598 sysfs_remove_group(&dev->kobj, &dev_attr_grp); 599 } 600 601 /* Interface Accociation Descriptor fields */ 602 #define usb_intf_assoc_attr(field, format_string) \ 603 static ssize_t \ 604 show_iad_##field (struct device *dev, struct device_attribute *attr, \ 605 char *buf) \ 606 { \ 607 struct usb_interface *intf = to_usb_interface (dev); \ 608 \ 609 return sprintf (buf, format_string, \ 610 intf->intf_assoc->field); \ 611 } \ 612 static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); 613 614 usb_intf_assoc_attr (bFirstInterface, "%02x\n") 615 usb_intf_assoc_attr (bInterfaceCount, "%02d\n") 616 usb_intf_assoc_attr (bFunctionClass, "%02x\n") 617 usb_intf_assoc_attr (bFunctionSubClass, "%02x\n") 618 usb_intf_assoc_attr (bFunctionProtocol, "%02x\n") 619 620 /* Interface fields */ 621 #define usb_intf_attr(field, format_string) \ 622 static ssize_t \ 623 show_##field(struct device *dev, struct device_attribute *attr, \ 624 char *buf) \ 625 { \ 626 struct usb_interface *intf = to_usb_interface(dev); \ 627 \ 628 return sprintf(buf, format_string, \ 629 intf->cur_altsetting->desc.field); \ 630 } \ 631 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL); 632 633 usb_intf_attr(bInterfaceNumber, "%02x\n") 634 usb_intf_attr(bAlternateSetting, "%2d\n") 635 usb_intf_attr(bNumEndpoints, "%02x\n") 636 usb_intf_attr(bInterfaceClass, "%02x\n") 637 usb_intf_attr(bInterfaceSubClass, "%02x\n") 638 usb_intf_attr(bInterfaceProtocol, "%02x\n") 639 640 static ssize_t show_interface_string(struct device *dev, 641 struct device_attribute *attr, char *buf) 642 { 643 struct usb_interface *intf; 644 struct usb_device *udev; 645 int len; 646 647 intf = to_usb_interface(dev); 648 udev = interface_to_usbdev(intf); 649 len = snprintf(buf, 256, "%s", intf->cur_altsetting->string); 650 if (len < 0) 651 return 0; 652 buf[len] = '\n'; 653 buf[len+1] = 0; 654 return len+1; 655 } 656 static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL); 657 658 static ssize_t show_modalias(struct device *dev, 659 struct device_attribute *attr, char *buf) 660 { 661 struct usb_interface *intf; 662 struct usb_device *udev; 663 struct usb_host_interface *alt; 664 665 intf = to_usb_interface(dev); 666 udev = interface_to_usbdev(intf); 667 alt = intf->cur_altsetting; 668 669 return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" 670 "ic%02Xisc%02Xip%02X\n", 671 le16_to_cpu(udev->descriptor.idVendor), 672 le16_to_cpu(udev->descriptor.idProduct), 673 le16_to_cpu(udev->descriptor.bcdDevice), 674 udev->descriptor.bDeviceClass, 675 udev->descriptor.bDeviceSubClass, 676 udev->descriptor.bDeviceProtocol, 677 alt->desc.bInterfaceClass, 678 alt->desc.bInterfaceSubClass, 679 alt->desc.bInterfaceProtocol); 680 } 681 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); 682 683 static struct attribute *intf_assoc_attrs[] = { 684 &dev_attr_iad_bFirstInterface.attr, 685 &dev_attr_iad_bInterfaceCount.attr, 686 &dev_attr_iad_bFunctionClass.attr, 687 &dev_attr_iad_bFunctionSubClass.attr, 688 &dev_attr_iad_bFunctionProtocol.attr, 689 NULL, 690 }; 691 static struct attribute_group intf_assoc_attr_grp = { 692 .attrs = intf_assoc_attrs, 693 }; 694 695 static struct attribute *intf_attrs[] = { 696 &dev_attr_bInterfaceNumber.attr, 697 &dev_attr_bAlternateSetting.attr, 698 &dev_attr_bNumEndpoints.attr, 699 &dev_attr_bInterfaceClass.attr, 700 &dev_attr_bInterfaceSubClass.attr, 701 &dev_attr_bInterfaceProtocol.attr, 702 &dev_attr_modalias.attr, 703 NULL, 704 }; 705 static struct attribute_group intf_attr_grp = { 706 .attrs = intf_attrs, 707 }; 708 709 static inline void usb_create_intf_ep_files(struct usb_interface *intf, 710 struct usb_device *udev) 711 { 712 struct usb_host_interface *iface_desc; 713 int i; 714 715 iface_desc = intf->cur_altsetting; 716 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 717 usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i], 718 udev); 719 } 720 721 static inline void usb_remove_intf_ep_files(struct usb_interface *intf) 722 { 723 struct usb_host_interface *iface_desc; 724 int i; 725 726 iface_desc = intf->cur_altsetting; 727 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) 728 usb_remove_ep_files(&iface_desc->endpoint[i]); 729 } 730 731 int usb_create_sysfs_intf_files(struct usb_interface *intf) 732 { 733 struct device *dev = &intf->dev; 734 struct usb_device *udev = interface_to_usbdev(intf); 735 struct usb_host_interface *alt = intf->cur_altsetting; 736 int retval; 737 738 retval = sysfs_create_group(&dev->kobj, &intf_attr_grp); 739 if (retval) 740 return retval; 741 742 if (alt->string == NULL) 743 alt->string = usb_cache_string(udev, alt->desc.iInterface); 744 if (alt->string) 745 retval = device_create_file(dev, &dev_attr_interface); 746 if (intf->intf_assoc) 747 retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp); 748 usb_create_intf_ep_files(intf, udev); 749 return 0; 750 } 751 752 void usb_remove_sysfs_intf_files(struct usb_interface *intf) 753 { 754 struct device *dev = &intf->dev; 755 756 usb_remove_intf_ep_files(intf); 757 device_remove_file(dev, &dev_attr_interface); 758 sysfs_remove_group(&dev->kobj, &intf_attr_grp); 759 sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp); 760 } 761